Add an end-to-end test for the OSS-Fuzz integration

[stefanbucur]

@oliverchang In #96 (review) you mentioned:

Perhaps we can have a GitHub action for this repo which checks out OSS-Fuzz at the latest revision and builds the test project? Seems like something that would fit better in this repo.

Just to confirm: would it be okay to submit a test project to the OSS-Fuzz repo (e.g., projects/bazel-rules-fuzzing) that runs the fuzzing examples in this repo? Is there a way to mark the project as "test only" so it doesn't run on the OSS-Fuzz infrastructure (it would use up resources unnecessarily)?

[oliverchang]

Yep, we already have similar projects such as https://github.com/google/oss-fuzz/blob/2cf181aa323c6bdeb1073622f0642782eb66acf9/projects/cifuzz-example/project.yaml#L5. You just need to specify "disabled: true"

[stefanbucur]

Fixed in #117.